Production of cardboard box cuttings



Sept. 12, 1939. A. PoNNDoRF Er AL `PRODUCTION,OFCARDBOARD BOX CUTTINGS Filed May 2o, 19:57 s sheets-sheet 1 Ziff/4m Sept. 12, 1939. A. PoNNDoRF Er AL Y 2,172,988

PRODUCTION 0F CARDBOARD BOX CUTTINGS Fild May 2o, 1957 s sheets-sheet 2 Sept 12, .1939. A. PoNNDoRF ET Al. 2,172,988

A I PRODUCTION OF CARDBOARD BOX CUTTINGS Filed May 20, 1937 3 Sheets-Sheet I5 A-r'ro Nav- Patented Sept. 12, 1939 UNITED STATES PATENT OFFI'QE PRODUCTION OF CARDBOAR-D BOX CUTTINGS Arthur Ponndorf and Walter Fuhrmann, Dresden, Germany, assignors to Universelle Cigarettenmaschinenfabrik .L C. Muller & Co.,

Dresden, Germany Application May 20, 1937, Serial No. 143,676 In Germany February 21, 1936 ,7 Claims.

This invention relates to a method and device for punching cuttings for cardboard boxes.

n the known devices of this class a cutting is punched out of a web of material through a die in one operation. This method is open to the objection that at high working speeds the cuttings cannot be removed from the die and piled up quickly enough.

The invention proposes a new method which permits much higher operating speeds and which consists in producing cuttings by 'punching oil" the waste portions from the web of material in two or more consecutive operations, the web remaining continuous until a cutting is separated during the last stamping operation. During the entire working process the cuttings to be pro-- duced remain in the plane of the web of material whilst the waste portions are pressed through dies The device for carrying out the method indicated comprises a punch formed of a plurality of tool parts to separate the waste material in one or more working strokes from the cutting, so that one or more cuttings are simultaneously produced which after completion are conducted away by a conveyor at a speed greater than the feeding speed of the material.

According to the invention, several conveyors may be arranged one behind the other, so that the cuttings after separation from the web of material are passed out of the operating range of the device by the last conveyor. It is further possible simultaneously to produce one or more cuttings by a corresponding regulation of the feed of the material.

By way of example, the invention is illustrated in the accompanying drawings, in which Figure 1 is a longitudinal section of theupper die; Fig. 2, a longitudinal section of the lower die on the lines vII--IL of Fig. 4; Fig. 3, a View of the upper die in the direction of the arrow A; Fig, 4, a View of the lower die in the direction of the arrow Bi; Fig. 5, a section on the line V-V, of Fig. 4; and Fig. 6, a View of the web of material with the wasteportions and cuttings marked.

Referring to the drawings, an endless web of material I, Fig. 6', passes between an upper and a lower die in the ldirection of the arrow C'. In the example shown, two cuttings 2 are produced at each working stroke, though it is possible of course to operate so as to produce only one cutting or more than two cuttings. Whilst the cuttings 2 remain in the plane of the web I, the lateral waste portions 3 are punched out rst. During the following working stroke the waste portions 4 are blanked and thereby the cuttings 2 separated from the endless web or strip I.

The upper die attached to a member, not shown,

carrying out an up and down motion substantially comprises a lplate 5 on the underside or" which 5 punching knives 6 correspon-ding to the shape of the waste portions 3 and punching knives 'I adapted to the form of the cuttings 4 are arranged, During the cutting stroke the knives 6, 'I enter corresponding passages 8, 9 of the lower '.10 die. The lower die substantially com-prises a base plate I0 which on its upper side carries the cutting plate II provided with passages 8, 9 and below the latter possesses the passages I2, I3 for the punched waste portions.

The finished cuttings 2 are removed by means of the rolls I4, I5 which are disposed in a recess I6 and at the front edge of the lower die It on the shafts I'I and I8. Therolls I4, I5 project with their circumference somewhat beyond the surface of the cutting plate II and are preferably covered with leather, etc. to insure good driving of the cuttings.

On the underside of the plate It driving means for the rolls I4, I5 are provided, which comprise a shaft 2B arranged in a bearing i9 and rotated by suitable means, not shown, to rotate the roll i4 by a chain gearing 2l, 22, 23. The front roll I5 leither idles or is driven from the shaft 2Q by a chain gearing 24, 25 in the direction of the arrow at a speed somewhat in excess o1 that of the Yroll I'4.

Directly opposite the rolls I4, I5 companion rolls 26, v2l are disposed on the upper die No special drive is imparted to these companion rolls which are arranged in the holders 2B, 2t which are cushioned and displaceably guided against the action of the tension springs 3B, 3i in the guides 32, 33 of the upper die. The holders 23. 29 project beyond the punching knives 6, 'l' and engage the cutting material rst and during further -descent of the upper die are pressed back against the action of their springs, On account of spring pressure, suicient frictional force is produced between the rolls 23, 2l and I, I5 and the material to insure unfailing engagement cf the nished cuttings.

In the construction shown, the endless web of material I is intermittently advanced by a drive, not shown, to the extent of the width of two cuttings 2. During the rst cutting stroke the knives I5 remove the waste portions 3 from the cutting and pass them through the openings I3 of the disc I0. At this time the knives 'l are still idling, but `when the web i is advanced to the extent of two cutting widths, the half punched cuttings pass also under the knives l. During the next stroke of the upper tool the knives l press the waste portions between the cuttings 2 through the lower die, so that two cuttings 2 are produced. Simultaneously, the knives 6 have removed again two lateral waste portions 3 from the web I, and at each further working stroke two cuttings will be nished.

We claim:

1. A method of punching out cardboard box blanks by means of punching tools which move up and down, which consists in producing at least two consecutively disposed blanks simultaneously from the web of material, the front and rear limiting lines of which are of different form, removing the waste portions laterally of the web under simultaneous nal shaping of the blanks at their lateral margins, retaining said blanks integral with said web only by the material of the Web corresponding to the dilerent forms of the front and rear limiting lines towards the middle of the web, removing said intervening material to free two successive blanks from each other and from the web, and conveying away the separated blanks.

2. A device for punching out cardboard cuttings from a web of material in which the web of material is intermittently conveyed in one direction, comprising a lower die formed of a plurality of tool members arranged one behind the other in the direction of the movement of the material, an upper die for punching waste portions surrounding the cuttings, said dies being so disposed that on the rst of the intermittent movements of the web, the lateral portions of the web are shaped to the final contour of the lateral sides of the cuttings under removal of the waste portions, and on the second of the intermittent movements of the web the middle portions of the .web which alone retain the cuttings integrally .together as part of the web, are removed, said middle portions corresponding to the divergence of form of the front and rear lines of the cuttings, ,and rollers for removing said cuttings when finally shaped.

3. A device for punching out cardboard cuttings from a web of material in which the web of material is intermittently conveyed in one direction, comprising a lower die formed of a plurality of tool members arranged one behind the other in the direction of the movement of the material, an upper die for punching Waste portions surrounding the cuttings, said dies being so disposed that on the iirst of the intermittent movements of the web, the lateral portions of the web are shaped to the nal contour of the lateral sides of the cuttings under removal of the waste portions, and on the second of the intermittent movements of the Web the middle portions of the web which alone retain the cuttings integrally together as part of the web, are removed, said middle portions corresponding to the divergence of form of the front and rear lines of the cuttings, and a plurality of conveyer devices arranged one behind the other, by which the blanks are fed in relation to one another until, after the strip of material has been separated from the last conveyer device, it is moved out of the range of operation of the apparatus.

4. A device lor punching out cardboard cuttings from a web of material in which the web of material is intermittently conveyed in one direction, comprising a lower die formed of a plurality of tool members arranged one behind the other in the directiton of the movement of the material, an upper die for punching waste portions surrounding the cuttings, said dies being so disposed that on the first of the intermittent movements of the web, the lateral portions of the web are shaped to the nal contour of the lateral sides of the cuttings under removal of the waste portions, and on the second of the intermittent movements of the web the middle portions of the web which alone retain the cuttings integrally together as part of the web, are removed, said middle portions corresponding to the divergence of form of the front and rear lines of the cuttings, and a plurality of conveyer devices arranged one behind the other, by which he blanks are fed in relation to one another until, after the strip of material has been separated from the last conveyer device, it is moved out of the range of operation of the apparatus, said conveyer device comprising driving rolls located in the operative path and in the range of operation of the dies, and spring-urged counter rolls arranged opposite the driving rolls.

5. A device for punching out cardboard cuttings from a web of material in which the web of material is intermittently conveyed in one direction, comprising a lower die formed of a plurality of tool, members arranged one behind the other in the direction of the movement of the material, an upper die for punching waste portions surrounding the cuttings, said dies being so disposed that on the rst of the intermittent movements of the web, the lateral portions` of the Web are shaped to the final contour of the lateral sides of the cuttings under removal of the waste portions, and on the second of the intermittent movements of the web the middle portions of the web which alone retain the cuttings integrally together as part of the web, are removed, said middle portions corresponding to the divergence of form of the front and rear lines of the cuttings, and means for conveying the cuttings comprising a plurality of rolls arranged in the lower die, and a drive for the rolls for rotating the rolls at a speed increasing in the direction of the web.

6. A device for punching out cardboard cuttings from a web of material in which the web of material is intermittently conveyed in one direction, comprising a lower die formed of a plurality of tool members arranged one behind the other in the direction of the movement of the material, an upper die for punching waste portions surrounding the cuttings, said dies being so disposed that on the rst of the intermittent movements of the web, the lateral portions of the web are shaped to the final contour of the lateral sides of the cuttings under removal of the waste portions, and on the second of the intermittent movements of the web the middle portions of the web which alone retain the cuttings integrally together as part of the web, are removed, said middle portions corresponding to the divergence of form of the front and rear lines of the cuttings, and means for conveying the cuttings comprising a plurality of rolls arranged in the lower die, a drive for the rolls for rotating the rolls at a speed increasing in the direction of the web, and companion rolls in the upper die cooperating with said rst rolls, cushioned and freely rotatably disposed therein.

7. A device for punching out cardboard cuttings from a web of material in which the web of material is intermittently conveyed in one direction, comprising a lower die formed of a plurality of tool members arranged one behind the other in the direction of the movement of the material, an upper die for punching waste portions surroundsponding to the divergence of form of the front and rear lines of the cuttings, rollers for removing said cuttings when nally shaped, and means for rotating said rollers so as to move the cuttings away from the dies at a greater speed than the 5 speed of movement of the web.

ARTHUR PONNDORF. WALTER F'UHRMANN. 

